Alcatel

Alcatel Lucent

André Bouille

Olivier Dauvillier

Rainer Mathes

Eric Dulac

Christian Savry

Lionel Favre-Felix

A fastener system with a coaxial annular flange () having through holes (), each serving to pass a screw () for screwing into an associated tapped hole () in the wall () of a stationary structure. Each through hole () has a circularly cylindrical distal segment () followed by an enlarged proximal segment () adjacent to the wall () of the stationary structure, allowing the shank () of the screw to bend and enabling a corresponding lateral offset (D). This prevents the screw () rupturing under high shear forces due to accidental destruction of a vacuum pump rotor while rotating at full speed.

Device for fixing a vacuum pump

There is provided a rotor for a turbo/drag vacuum pump, the rotor comprising an upstream rotor segment of the turbine type made of metal or alloy, and a downstream rotor segment of Holweck type made of composite material. The downstream segment of the rotor has a reinforcing structure made of long fibers that are distributed in a manner that varies as a function of the section under consideration: in the annular connection region connected to the upstream segment of the rotor, the fibers are inclined and/or spaced apart in order to conserve sufficient flexibility for the composite material to enable it to deform so as to track deformation of the metal of the upstream rotor segment while it is in operation; in contrast, the fibers are close together and form turns that touch in the downstream region of the skirt, thereby guaranteeing greater stiffness in order to withstand the mechanical stresses that occur during high-speed rotation of the rotor in operation. It is thus possible to make a rotor with a Holweck type skirt that is of greater diameter, thereby improving the properties of the pump.

Turbo/drag pump having a composite skirt

The invention concerns a contact roller bearing for a vacuum pump comprising a rotor roller bearing ring () a coaxial stator roller bearing ring () between which are provided rolling elements () housed in succession and urged to roll on respective raceways of the rotor () and stator () roller bearing rings. The rolling elements comprise an alternating succession of rolling elements () whereof the outer surface is made of steel and of rolling elements () whereof the outer surface is made of ceramic, thereby reducing the resistance to acceleration of the contact roller bearing, which limits the friction and wear of the inner annular surface () of the contact roller and the corresponding bearing of the rotor.

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Annecy, France

André Bouille